docs: fix broken cross-links

Author: rlindner81

docs/service/index.md

@@ -100,7 +100,7 @@ Update the toggle state on Redis, which in turn is published to all server insta
   ...
   ```
 
-- Valid Request with [clearSubScopes]({{ base_url }}/usage/#updating-feature-value)
+- Valid Request with [clearSubScopes]({{ site.baseurl }}/usage/#updating-feature-value)
   ```http
   POST /rest/feature/redisUpdate
   Authorization: ...

docs/usage/index.md

@@ -308,7 +308,7 @@ await changeFeatureValue("/srv/util/logger/logLevel", "error", {}, { clearSubSco
 ```
 
 will set the root-scope value to `"error"` and remove all sub-scopes. See
-[scoping]({{ base_url }}/architecture/#scoping) for context.
+[scoping]({{ site.baseurl }}/architecture/#scoping) for context.
 
 ### Resetting Feature Value